A COMPILED CATALOG OF OPTICAL POSITIONS OF EXTRAGALACTIC RADIO-SOURCES

Based on 28 individual catalogues, in which the positions of optical c ounterparts of extragalactic radio sources are listed, we compiled a c ombined catalogue by means of a weighted least squares adjustment. The catalogue is in the system of FK5/J2000.0. It consists of about five hundred sources, among which there are 56 primary sources with positio n uncertainties as 0.09 ''. Comparisons show that the orientation diff erences between optical and radio frames are A(1) = -0.013 '' +/- 0.01 2 '', A(2) = 0.077 '' +/- 0.012 '', A(3) = 0.005 '' +/- 0.009 ''. Loca l relative deformations are not obvious within the precision of ground -based optical observations.